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AuthorAl-Samaneh, Ahmeddc.contributor.author
Date of accession2016-03-15T10:39:53Zdc.date.accessioned
Available in OPARU since2016-03-15T10:39:53Zdc.date.available
Year of creation2014dc.date.created
AbstractFrequency standards or clocks provide time references for a wide range of applications such as synchronization of communication networks, remote sensing and global positioning. Over the last couple of decades, demands on the data rates of many communication systems have substantially increased, imposing more restricted requirements on the stability of their timing devices. At the same time applications have become more mobile, increasing the demand for small clocks with low power consumption. Atomic clocks have provided the most stable frequency references for more than 50 years. However, the size and power requirements of microwave-cavity-based atomic clocks prohibit them from being portable and battery-operated. Hence, research on miniaturized atomic clocks (MACs) has been carried out by various research groups. A European research project on MACs, funded by the European commission, started in 2008. This dissertation reports on the achievements within the European research project in the development of suitable lasers for such atomic clocks. Vertical-cavity surface-emitting lasers (VCSELs) are compelling light sources for MACs because of their low power consumption, high modulation bandwidth, and favorable beam characteristics. VCSELs must feature polarization-stable single-mode emission. Additionally, they must provide narrow linewidth emission at a center wavelength of about 894.6 nm and be well suited for harmonic modulation at about 4.6 GHz in order to employ coherent population trapping effect at the cesium D1 line. The polarization orientation of the emitted light of a standard VCSEL is a priori unknown. Polarization control is achieved by etching a shallow surface grating in the top Bragg mirror. For the purpose of integration with the clock microsystem, flip-chip-bondable VCSEL designs are realized. Such designs facilitate not only a straightforward mounting but also make the electrical contacts high-frequency compatible.dc.description.abstract
Languageendc.language.iso
PublisherUniversität Ulmdc.publisher
LicenseStandarddc.rights
Link to license texthttps://oparu.uni-ulm.de/xmlui/license_v3dc.rights.uri
KeywordCoherent population trapping (CPT)dc.subject
KeywordPolarization stability and controldc.subject
KeywordSurface gratingdc.subject
KeywordVertical-cavity surface-emitting laserdc.subject
Dewey Decimal GroupDDC 620 / Engineering & allied operationsdc.subject.ddc
LCSHAtomic clocksdc.subject.lcsh
LCSHCesiumdc.subject.lcsh
LCSHSemiconductor lasersdc.subject.lcsh
TitleVCSELs for cesium-based miniaturized atomic clocksdc.title
Resource typeDissertationdc.type
DOIhttp://dx.doi.org/10.18725/OPARU-3205dc.identifier.doi
PPN798745886dc.identifier.ppn
URNhttp://nbn-resolving.de/urn:nbn:de:bsz:289-vts-92167dc.identifier.urn
GNDAtomuhrdc.subject.gnd
GNDVCSEL-Laserdc.subject.gnd
FacultyFakultät für Ingenieurwissenschaften und Informatikuulm.affiliationGeneral
Date of activation2014-10-07T10:29:38Zuulm.freischaltungVTS
Peer reviewneinuulm.peerReview
Shelfmark print versionW: W-H 13.803uulm.shelfmark
DCMI TypeTextuulm.typeDCMI
VTS ID9216uulm.vtsID
CategoryPublikationenuulm.category
Bibliographyuulmuulm.bibliographie


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